Linter compatibility | Baseline JS

Measurements update weekly and on manual dispatch. See the ESLint TypeScript setup, Oxlint limitation, and feature coverage.

eslint-plugin-baseline-js 0.7.7 from npm.Recorded 2026-11-02 18:24:09 UTC.

Baseline 2019. Red lines show expected warnings. Tables show actual toolchain results. ✅ Correct result. ❌ Unsupported checks could not be verified.

Latest toolchain

Captured 2026-11-02 18:24:04 UTC.ESLint 10.14.0 · Oxlint 1.90.0 · Bun 1.4.4-canary.20261102.1+271b65e

Logical assignment

Expected warning

let value;
value ||= 1;

Not in Baseline 2019. Expected warning for logical-assignments at line 2, column 7.

Logical assignment, latest toolchain results
ESLint	Oxlint	Bun
Warns	Warns	Warns

Static Object.groupBy

Expected warning

Object.groupBy([], String);

Not in Baseline 2019. Expected warning for array-group at line 1, column 8.

Static Object.groupBy, latest toolchain results
ESLint	Oxlint	Bun
Warns	Warns	Warns

Computed Object.groupBy

Expected warning

Object['groupBy']([], String);

Not in Baseline 2019. Expected warning for array-group at line 1, column 8.

Computed Object.groupBy, latest toolchain results
ESLint	Oxlint	Bun
Warns	Warns	Warns

Shadowed Object parameter

No warning expected

function local(Object) {
  Object.groupBy([], String);
}

Shadowed Object parameter, latest toolchain results
ESLint	Oxlint	Bun
No warning	No warning	No warning

Shadowed Object binding

No warning expected

const Object = { groupBy() {} };
Object.groupBy([], String);

Shadowed Object binding, latest toolchain results
ESLint	Oxlint	Bun
No warning	No warning	No warning

Global fetchLater

Expected warning

fetchLater('/beacon');

Not in Baseline 2019. Expected warning for fetchlater at line 1, column 1.

Global fetchLater, latest toolchain results
ESLint	Oxlint	Bun
Warns	Warns	Warns

TypeScript static Object.groupBy

Expected warning

declare const input: string[];
Object.groupBy(input, String);
export {};

Not in Baseline 2019. Expected warning for array-group at line 2, column 8.

TypeScript static Object.groupBy, latest toolchain results
ESLint	Oxlint	Bun
Warns	Warns	Warns

Typed Element.checkVisibility

Expected warning

declare const element: Element;
element.checkVisibility();
export {};

Not in Baseline 2019. Expected warning for check-visibility at line 2, column 9.

Typed Element.checkVisibility, latest toolchain results
ESLint	Oxlint	Bun
Warns	Unsupported	Unsupported

Typed Set.union

Expected warning

declare const values: Set<unknown>;
values.union(new Set());
export {};

Not in Baseline 2019. Expected warning for set-methods at line 2, column 8.

Typed Set.union, latest toolchain results
ESLint	Oxlint	Bun
Warns	Unsupported	Unsupported

Structural lookalike

No warning expected

const element = { checkVisibility() { return true; } };
element.checkVisibility();
export {};

Structural lookalike, latest toolchain results
ESLint	Oxlint	Bun
No warning	Unsupported	Unsupported

Named interface lookalike

No warning expected

interface Element { checkVisibility(): boolean }
declare const element: Element;
element.checkVisibility();
export {};

Named interface lookalike, latest toolchain results
ESLint	Oxlint	Bun
No warning	Unsupported	Unsupported

Host API checks

latest toolchain host API checks
Host API	ESLint	Oxlint	Bun
Plugin options	Works	Works	Works
AST selectors	Works	Works	Works
Function scope shadowing	Works	Works	Works
Top-level scope binding	Works	Works	Works
Source text and tokens	Works	Works	Works
Diagnostic locations	Works	Works	Works
Node ancestry	Works	Works	Works
TypeScript receiver services	Works	Unsupported	Unsupported

Pinned toolchain comparison

Pinned toolchain

Captured 2026-11-02 18:24:09 UTC.ESLint 10.13.0 · Oxlint 1.88.0 · Bun 1.4.3-canary.20261017.1+017b243

Logical assignment

Expected warning

let value;
value ||= 1;

Not in Baseline 2019. Expected warning for logical-assignments at line 2, column 7.

Logical assignment, pinned toolchain results
ESLint	Oxlint	Bun
Warns	Warns	Warns

Static Object.groupBy

Expected warning

Object.groupBy([], String);

Not in Baseline 2019. Expected warning for array-group at line 1, column 8.

Static Object.groupBy, pinned toolchain results
ESLint	Oxlint	Bun
Warns	Warns	Warns

Computed Object.groupBy

Expected warning

Object['groupBy']([], String);

Not in Baseline 2019. Expected warning for array-group at line 1, column 8.

Computed Object.groupBy, pinned toolchain results
ESLint	Oxlint	Bun
Warns	Warns	Warns

Shadowed Object parameter

No warning expected

function local(Object) {
  Object.groupBy([], String);
}

Shadowed Object parameter, pinned toolchain results
ESLint	Oxlint	Bun
No warning	No warning	No warning

Shadowed Object binding

No warning expected

const Object = { groupBy() {} };
Object.groupBy([], String);

Shadowed Object binding, pinned toolchain results
ESLint	Oxlint	Bun
No warning	No warning	No warning

Global fetchLater

Expected warning

fetchLater('/beacon');

Not in Baseline 2019. Expected warning for fetchlater at line 1, column 1.

Global fetchLater, pinned toolchain results
ESLint	Oxlint	Bun
Warns	Warns	Warns

TypeScript static Object.groupBy

Expected warning

declare const input: string[];
Object.groupBy(input, String);
export {};

Not in Baseline 2019. Expected warning for array-group at line 2, column 8.

TypeScript static Object.groupBy, pinned toolchain results
ESLint	Oxlint	Bun
Warns	Warns	Warns

Typed Element.checkVisibility

Expected warning

declare const element: Element;
element.checkVisibility();
export {};

Not in Baseline 2019. Expected warning for check-visibility at line 2, column 9.

Typed Element.checkVisibility, pinned toolchain results
ESLint	Oxlint	Bun
Warns	Unsupported	Unsupported

Typed Set.union

Expected warning

declare const values: Set<unknown>;
values.union(new Set());
export {};

Not in Baseline 2019. Expected warning for set-methods at line 2, column 8.

Typed Set.union, pinned toolchain results
ESLint	Oxlint	Bun
Warns	Unsupported	Unsupported

Structural lookalike

No warning expected

const element = { checkVisibility() { return true; } };
element.checkVisibility();
export {};

Structural lookalike, pinned toolchain results
ESLint	Oxlint	Bun
No warning	Unsupported	Unsupported

Named interface lookalike

No warning expected

interface Element { checkVisibility(): boolean }
declare const element: Element;
element.checkVisibility();
export {};

Named interface lookalike, pinned toolchain results
ESLint	Oxlint	Bun
No warning	Unsupported	Unsupported

Host API checks

pinned toolchain host API checks
Host API	ESLint	Oxlint	Bun
Plugin options	Works	Works	Works
AST selectors	Works	Works	Works
Function scope shadowing	Works	Works	Works
Top-level scope binding	Works	Works	Works
Source text and tokens	Works	Works	Works
Diagnostic locations	Works	Works	Works
Node ancestry	Works	Works	Works
TypeScript receiver services	Works	Unsupported	Unsupported

Versions, evidence, and reproduction

The latest toolchain follows host and parser releases, including Bun canary. The pinned comparison uses reviewed, exact versions. Both test the same npm release with a fixed TypeScript version within the parser's supported range.

These measurements cover the saved code, configuration, npm release, and tool versions. They do not establish full compatibility. Unknown means the observation could not be established. Run error means the check failed to run. Not measured means no usable observation is available. A false positive is a warning where none is expected.

A failed or canceled publication can leave an older result here. Copy keeps the snapshot displayed on this page. A retry can reuse completed observations from the same workflow run. Capture dates and collection identities retain their origin.

Run 10, attempt 1. Harness revision 1bb8308055fd434024347fa9eddd41d64c481e45.

Snapshot JSON · Saved inputs and lockfiles · Reproduction commands

Exact npm package, resolved 2026-11-02 18:23:40 UTC.

Package integrity sha512-BACS9mwBXmtZaGzVeIlfKxjAw0KlJkZ9fBH3YYp6jKE6ZUMNkzrIwixuWnYtPEfDsD8EswCaK9FQLXKIMUuwgQ==.

Pinned execution evidence

Parser 8.71.2. TypeScript 6.0.3. Execution report · Collection identity.

ESLint package 10.13.0, pinned channel. Executable v10.13.0.
Oxlint package 1.88.0, pinned channel. Executable 1.88.0.
Bun package 1.4.3-canary.20261017.1+017b243, canary channel. Executable 1.4.4-canary.1+5f5799ed1.

TypeScript receiver services, Oxlint. Unsupported
typed parser services unavailable
Standard output · Standard error
TypeScript receiver services, Bun. Unsupported
typed parser services unavailable
Standard output · Standard error
Typed Element.checkVisibility, Oxlint. Unsupported
Required receiver analysis is unavailable; this case remains unverified
Standard output · Standard error
Typed Element.checkVisibility, Bun. Unsupported
Required receiver analysis is unavailable; this case remains unverified
Standard output · Standard error
Typed Set.union, Oxlint. Unsupported
Required receiver analysis is unavailable; this case remains unverified
Standard output · Standard error
Typed Set.union, Bun. Unsupported
Required receiver analysis is unavailable; this case remains unverified
Standard output · Standard error
Structural lookalike, Oxlint. Unsupported
Required receiver analysis is unavailable; this case remains unverified
Standard output · Standard error
Structural lookalike, Bun. Unsupported
Required receiver analysis is unavailable; this case remains unverified
Standard output · Standard error
Named interface lookalike, Oxlint. Unsupported
Required receiver analysis is unavailable; this case remains unverified
Standard output · Standard error
Named interface lookalike, Bun. Unsupported
Required receiver analysis is unavailable; this case remains unverified
Standard output · Standard error

Latest execution evidence

Parser 8.72.1. TypeScript 6.0.3. Execution report · Collection identity.

ESLint package 10.14.0, latest channel. Executable v10.14.0.
Oxlint package 1.90.0, latest channel. Executable 1.90.0.
Bun package 1.4.4-canary.20261102.1+271b65e, canary channel. Executable 1.4.4-canary.1+271b65ec6.

TypeScript receiver services, Oxlint. Unsupported
typed parser services unavailable
Standard output · Standard error
TypeScript receiver services, Bun. Unsupported
typed parser services unavailable
Standard output · Standard error
Typed Element.checkVisibility, Oxlint. Unsupported
Required receiver analysis is unavailable; this case remains unverified
Standard output · Standard error
Typed Element.checkVisibility, Bun. Unsupported
Required receiver analysis is unavailable; this case remains unverified
Standard output · Standard error
Typed Set.union, Oxlint. Unsupported
Required receiver analysis is unavailable; this case remains unverified
Standard output · Standard error
Typed Set.union, Bun. Unsupported
Required receiver analysis is unavailable; this case remains unverified
Standard output · Standard error
Structural lookalike, Oxlint. Unsupported
Required receiver analysis is unavailable; this case remains unverified
Standard output · Standard error
Structural lookalike, Bun. Unsupported
Required receiver analysis is unavailable; this case remains unverified
Standard output · Standard error
Named interface lookalike, Oxlint. Unsupported
Required receiver analysis is unavailable; this case remains unverified
Standard output · Standard error
Named interface lookalike, Bun. Unsupported
Required receiver analysis is unavailable; this case remains unverified
Standard output · Standard error